Combined blank hold-down means and burr-removing mechanism for screwslotting machines



Sept. 23, 1958 A. M. PuTETTl COMBINED BLANK HOLD-DOWN MEANS AND BURR-REMOVING MECHANISM FOR scREw-sLoTTING MACHINES 4 Sheets-Sheet 1 Filed D00. l5, 1953 lrhrln! lfm fin E ...Whal

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COMBINED BLANK How-DOWN MEANS AND EURE-EEMovING MECHANISM FOR scREw-sLoTTING MACHINES Filed Dec. 15. 1953 4 Sheets-Sheet 2 www A TTORNE Y IN VEM'QN A. M. PUTETTI 2,852,788 COMBINED BLANK HOLD-DOWN MEANS AND BUR FOR s Es Sept. 23, 1958 R-REMOVING MECHANISM CREW-SLOTTING MACHIN Filed Deo. 15, 1953 4 Sheens-Sheel 5 INVENTOR l @Wm ATT( )RNEYS y Sept. 23, 1958 A. M. PuTETTl 2,852,788

COMBINED BLANK HOLD-DOWN MEANS AND BURR-REMOVING MECHANISM FOR scREw-sLoTTING MACHINES Filed Deo. l5, 1953 4 Sheets-Sheet 4 @15.6. S. gjjm" I [34 l l l 3/8 4( f 37 35 v/ A 4.1/ I W 312V INVENTOR BY /-VMV/s United States Patent O COMBINED BLANK Horn-DOWN MEANS AND BURRnEMoviNG MECHANISM Fon SCREW- sLorrlNG MACHiNEs Anthony Michael Putetti, Waterbury, Conn., assignor to The Waterbury Farrel Foundry `r Machine Company, Waterbury, Conn., a corporation of Connecticut Application December 15, 1953, Serial No. 398,296

4 Claims. (Cl. 10-6) This invention relates to a screw-slotting machine, and more particularly to a burr-removing mechanism for such a machine.

As illustrated, the screw-slotting machine of the present application is of the type shown in the copending application of Joseph M. Schaeffer, Serial No. 280,767, led April 5, 1952, now U. S. Patent No. 2,737,669 issued March 13, 1956, wherein a blank-carrying dial is rotatably mounted in a supporting head, which dial is provided with a plurality of radially disposed grooves in its outer face for reception of the screw blanks to be slotted. A saw or cutter is rotatably mounted within the carrier dial but upon an axis eccentric to that of the dial so that as the blanks are carried around by the dial, they will at one zone of their path be engaged by the slotting saw.

In the slotting operation burrs are often formed upon the blanks at the edge of the slot, which burrsrequire removal in some manner. It has been proposed to provide cutters integrally formed with the carrier dial and to rotate the blanks at one portion of `their movement as they are carried around by the dial so as to engage the blank heads with the burr-removing cutters. In such an arrangement individual burr-removing cutters are pro'- vided at each of the blank-receiving slots of the dial, and it will be appreciated that when the cutters become dull, it is necessary to disassemble the device and re` move the dial in order to sharpen the cutters or to replace the dial with another 'having sharp cutters thereon.

In either case considerable effort and time is required for such an operation during which the slotting machine must stand idle.

It is usual in a slotting machine of this kind to provide to engage the side faces of the heads and remove the burrs therefrom. This head ring is, as stated, removable so that it may be readily removed from the carrier dial and either sharpened or replaced by a new one with little effort.

In addition, there is provided means for rotating the blanks at one portion of their paths, after they have been engaged by the slotting saw, so that the blank heads `will be rotated in engagement with the cutting members on the head ring in order to remove the burrs therefrom.

Moreover, the removable head ring may be formed to support and retainand also cut the burrs from any type of screw head so that when `it is desired to use the machine with a different type of screw, it is only necessary e ICC removing cutters were formed integrally with the carrier dial, it was necessary to use a different dial with each diierent type of screw head. Moreover, as all of the burr-removing cutters are provided on a single head ring, this ring can be removed and replaced conveniently, thus removing and replacing all the cutters as a unit, which is much more economical in regard to the time required for the operation than would be the removal and application of each of the cutters individually.

One object of the invention is to provide a new and improved burr-removing mechanism for a. screw slotter or like device. l

A still further object of the invention is to provide a screw-slotting machine having a carrier dial for the blanks and an internal eccentrically mounted screwslotting saw with a head ring having cutters thereon registering with the sl-ots in the dial to remove the burrs from the slotted heads after the slotting operation.

Still another object of the present invention is to provide a burr-removing device for screw-slotting machines of the character described wherein the burr-removing cutters are provided on a head ring removably secured to the carrier dial. t

A still further object of the invention is to provide, in.

a screw-slotting machine of the character described, a head ring removably attached as a unit to the carrier dial, which head ring will not only engage the heads of the blanks to retain the latter in place in the dial, but will also vbe provided with cutters to remove the cutters.

To these and other ends the invention consists in the#A novel `features and combinations of parts to be hereinafter described and claimed. t

In the accompanying drawings:

Fig. 1 is a front elevational view of a screw-slotting i device embodying my invention;

Fig. 2 is a sectional view on line 2- 2 of Fig. l;

Fig. 3 is a sectional view through the blank-rotating mechanism on line 3 3 of Fig. l;

Fig. 4 is a plan View looking in the direction of the" arrows 4 4 on Fig. 3;

Fig. 5 is a sectional view through the carrier dial on` line 5 5 of Fig. l;

Fig. 6 is a front elevational view of the `head ring i having the burr-removing cutters mounted thereon;

Fig. 7 is a side elevational view of Fig. 6;

Figs. 8 and 9 are sectional views taken respectively on lines 8 8 and 9 9 of Fig. 6; and

Fig. 10 is a view similar toFig. 9 but showing a section of a head ring for a screw having means at one side for cutting a burr from a round headed screw and means at the other side for cutting a burr from a screw having a head of another shape.

To illustrate a preferred embodiment of my inventionl I have shown in the drawings a screw-slotting device having a stationary head 10 in which is rotatably mounted a gear 11 having secured to the front face thereof a` carrier dial 12. Rotatably mounted within the gear 11 is a shaft 13 which carries the slotting cutter 14. As shown more especially in Figs. 1 and 2, the axis of the t shaft 13 is eccentric to that of the rotatable gear 11 so that the teeth of the cutting saw 14 will engage the heads of the blanks carried by the carrier dial 12 during one portion or zone of their movement.

The carrier dial 12 is provided upon its front face with a plurality of radially directed slots 15 to receive the screw blanks with the heads of these blanks projecting inwardly toward the axis of the dial. A feed-in Wheel 16v 3V (Fig. l) is rotatably mounted forwardly of the carrier dial, this wheel being provided with a plurality of Vscrewreceiving slots -or notches 17 to receive screw blanks from any` desiredl source 'such asa chute (not shown) and deliver-these blanksto the slots 15 infthe carrier dial.

A presser. plate member 18 is provided forwardly of the dial,` this member being of-arcuate shape and extending over anarc of approximately 270l degrees (so asy to clear the/feedinwheel.Y 16), this carrier dialengaging the screw blanks at` the Side oppositeA the dial 12 sovas to hold the blanks against the dial. This presser plate may be resiliently and:y adjustably held in place by screws 19 threaded into spring iingers of the plate Ztl' which is attached. by screws 21 to a cover. plate 22 whichisin turn secured to the head 10.

Thecover plate 22v is provided with anl arcuate: open'- ingtoreceive the presser plate 18 and the position of the latter Vtoward andfrom the face. of thedial mayy be adjusted by the4 screws. 19. lRotation ofthe presser plate with relation to the cover platev is prevented by the provision of arecess 23 formed inthe presser plate 18V in which recess is received a lug or key 24. secured to` the ycover plate by a screw 25. Thus the presser plate is held in place. but permitted movements toward andfro-mthe blank-carrying dial 12 as regulated by the screw.. 19 andthe spring fingers of the plate Ztl.

At one portion of the presser plate 18 provision is made for rotating the blanks on their axes in order to bring.

theirV heads into engagement with the burrfrernoving cutters arranged on the dial, as will be hereinafter explained.. For this purpose the presser plateis recessedasfshown, Aatf2,7Fg. 3, and slidably mounted in this recessis an..Y insert 28 which may move. toward and fromsthe face of.

the dial. A spacer member 29 engages the rearA face of the,block 28this member being engaged by anadjusting screw 30 threaded into a spring plate or finger 31 secured to the cover plate 22. It may be noted that the spring linger 31 is separate from the fingers ofthe plate ,201 so tliatthe pressure against the block 28 may be separately adjusted without aecting the `adjustment of the presser plate 18.

Secured to the forward face of the member 28 is a member 32 having serrations 33 thereon adapted, as shown in Fig'.l 3, to engage the shank` of a screw blank indicated" at34 and rotate this `blank as it is carried past the serratedmember by rotation of the dial12. From ythe above, it will be seen that asthe blanks are carried around by the dial, the pressure exerted upon them by the insert 28maybe separately adjusted by the screw. 3Min order that the proper pressure may be exerted upon the blanks torotate them when they arrive opposite the serrated member 32.

In order to retain the blanks from dropping out of the slots 15 in the face of the carrier ring and to provide burr-removing cutters to remove the burrs from the yslotted blanks during their rotation by the serrated mem* ber 32, a head ring is secured to the carrier dial 12, this head ring being of the form shown in Figs- 6 and 7. This member is f` circular form, as shown at 36, and is provided with axially directed grooves 37 cut across its peripheral surface to provide upstauding cutting teeth 38. having cutting edges 39 thereon. It will be understood that only one ofthe edges of the cutters Stir is a cutting edge asthe blanks, upon rotation, Will strike onlyone edge of these members. The cutting edges 39 are directed radially toward the center of the head ring 36, and the opposite edgesrof these members are substantially parallel to this edge.

Thisfhead ring i'issecured within the carrier dial 12 byfscrews 46 (Fig 2)`so that the outer surfaces of the cutter members 38 standv against the inner periphery of the carrier and the cutting edges 39 face forwardly toward the screw blanks. As this member also serves as a retainer for the screws, each of the members 38` is slotted, as shown at- 41 (Fig. 8), to receive an edge of the head of the blank and permit the body portion of the ring to underlie a` portion of the periphery of the head. As shown in Fig. S, the -blank 34 is a beveled headed screw and, therefore, the recess or notch 41 is similarly beveled so thatit will engage the screw head over substantially the entire lateral surface as the Iscrew isrotated,.and thus the cutting edge 39 will cut the burr from-the slot 42.

The head of the blank, as shown in Fig.l 8, will rest against the inner `wall 43 of the beveled slot 41 soas to restrain the blank from moving inwardly. Thus the head ring acts as a retaining ring secured-to the` carrier to hold the screws in place as well as providing a removable supportfor the cutters38.

The head ring Sois. provided withopenings 44 through which the screws It@ may be inserted to secure this memer to the carrier ring, the openings 44- being made slightly' larger than thev body of the screws in order to permit adjustment of the head ring toward and from the face of the carrier dial as is desirable.v This adjustment may be readily made by the provision` ofrecesses 45 (Figs. 5 and 7) formedin the rear face of the retaining ring, these recesses having beveled front edges 46 against which impinges the pointed end 47 of adjusting screwsA are substantially at the center of the adjacent blankvk receiving slot 15 so that the most eiicient burring action will result as thisedge will then be on the diameter of the head of the blank.

In Fig. 10r of the drawings I have shown a somewhat modified form of head ring in Which the `cutting teeth' 32a are provided on one face `with a beveled recess 41a `and' the cutters thus arranged to deburr a screw with a 'beveled head and on the other face with a recess 41b of arcuate shape to receive and cut the burr from a round headed screw. It will, of course, be understood that the shape of this `recess should conform to the shape of the head of the screw with which it is used. By providing cutting edges on -both faces of the cutting teeth 32a, one head ring maybe providedr with two cutting faces and, therefore, serve a double function. It will, of course, be understood that grooves of the same shape may be provided on each face of the` teeth, and in that event it would only be necessary to turn the ringface for face when one edge becomes dull. In any event, a supporting surface 43 or 43a is shown in Fig. l0 which is provided for support ofthe head of the blank.

It will be apparent that I have provided a retaining ring on the carrier instead of on the presser plate as has been the case heretofore and that this head ring or retaining ring is removably attached to the carrier ldial and is pro'- vided with acutting tooth on each adjacent edge of the blank-carrying slots in the dial. When the teeth become dull, it is a relatively simple matter to remove the screws 40 and replace the head ring with another and to sharpen the edges of the one which has been removed. With-the burr-removing cutters formed integrally on the head ring which is'y removably attached to the carrier, it is a simple mattei-.to sharpen these' cutters as compared to the work involved when the cutters are formed integrally with theV essayes' What I claim is:

1. A screw-slotting machine comprising a head member, a carrier dial rotatably mounted therein having radially directed slots in a face thereof to receive the shanks of the screw blanks, means for slotting the heads of the blanks as they are carried in a circular path by the dial, pressure means for holding said blanks in said slots and comprising means adjacent one portion of said path following that portion in which the slotting is effected for rotating the blanks on their axes, said dial being of ringlike form and having an inner cylindrical periphery, a retaining ring, also having a continuous cylindrical periphery removably secured to the inner periphery of the dial and provided with means to engage the heads of the blanks and retain them in the dial, and said ring having a plurality of grooves cut across the peripheral surface thereof to provide cutting teeth adjacent the dial slots to remove the burrs from the blanks as they are rotated by said rotating means, said pressure means being disposed entirely outwardly of the cylindrical periphery of the retaining ring.

2. A screw-slotting machine comprising a head member, a carrier dial rotatably mounted therein having radially directed slots in a face thereof to receive the shanks of the screw blanks, means for slotting the heads of the blanks as they are carried in a circular path by the dial, pressure means for holding said blanks in said slots and comprising means adjacent one portion of said path following that portion in which the slotting is eiected for rotating the blanks on their axes, said dial being of ringlike form and having an inner cylindrical periphery, a retaining ring, also having a continuous cylindrical periphery removably secured to the inner periphery of the dial and provided with means to engage the heads of the blanks and retain them in the dial, and said ring having a plurality of grooves cut across the peripheral surface thereof to provide cutting teeth adjacent the dial slots to remove the burrs from the blanks as they are rotated by said rotating means, said pressure means being disposed entirely outwardly of the cylindrical periphery of the redi taining ring, and means for adjusting said ring axially of the dial.

3. A screw-slottng machine comprising a head member, a carrier dial of ring-like form rotatably mounted therein having radially directed slots in a face thereof to receive the Shanks of the screw blanks, means for slotting the heads of the blanks as they are carried in a circular path by the dial, means adjacent one portion of said path following that portion in which the slotting is elected for rotating the blanks on their axes, and a ring removably secured to the inner periphery of the dial having cutting teeth thereon adjacent the dial slots to cut the burrs from the blanks as they are rotated by said rotating means, said teeth having cutting edges at both faces of the ring whereby the ring may be reversed and the cutting edges at either side positioned adjacent the dial slots.

4. A screw-slotting machine comprising a head member, a carrier dial of ring-like form rotatably mounted therein having radially directed slots in a face thereof to receive the Shanks of the screw blanks, means for slotting the heads of the blanks as they are carried in a circular path by the dial, means adjacent one portion of said path following that portion in which the slotting is effected for rotating the blanks on their axes, and a ring removably secured to the inner periphery of the dial having cutting teeth thereon adjacent the dial slots to cut the burrs from the blanks as they are rotated by said rotating means, said teeth being provided with cutting edges at both faces of the ring and having grooves in both faces thereof to conform to the shape of the head of the blank being cut, and the groove upon one face being of a shape different from that of the groove upon the other face.

References Cited in the file of this patent UNITED STATES PATENTS 1,977,556 Hogue Oct. 16, 1934 2,642,594 Fray June 23, 1953 2,676,343 Steinfurth Apr. 27, 1954 FOREIGN PATENTS 102,913 Austria Nov. 15, 1925 

